King County, WA

1,364 public highway bridges

King County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, King County, Washington contains 1,364 public highway bridges. Roughly 31% are rated “Good,” 33.4% “Fair,” and 3.3% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.

Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

1,364

Total Bridges

31%

Good

33.4%

Fair

3.3%

Poor Condition

Condition Distribution

Good

31% (423)

Fair

33.4% (456)

Poor

3.3% (45)

All Bridges (1,364)

Sort:

I-5

Over: NE NORTHGATE WAY

2.0 N JCT SR 522, King, WA

Built 1964 ADT: 45,581

I-5

Over: NE NORTHGATE WAY

2.0 N JCT SR 522, King, WA

Built 1964 ADT: 46,050

SR 18

Over: M STREET

0.6 E JCT SR 164, King, WA

Built 1984 ADT: 18,226

I-90 EB

Over: I-90 WB

JCT I-5, King, WA

Built 1988 ADT: 9,982

NE 51ST STREET

Over: SR 520

3.9 E JCT I-405, King, WA

Built 1987 ADT: 61,404

NE 4TH STREET

Over: I-405

2.4 N JCT I-90, King, WA

Built 1987 ADT: 9,639

I-90

Over: RAINIER AVE

0.6 E JCT I-5, King, WA

Built 1988 ADT: 28,381

CITY ST - 76TH AVE

Over: I-90

4.0 E JCT I-5, King, WA

Built 1989 ADT: 125,642

77TH AVE SE

Over: I-90

4.2 E JCT I-5, King, WA

Built 1989 ADT: 118,092

80TH AVE

Over: I-90

4.4 E JCT I-5, King, WA

Built 1988 ADT: 118,092

ISLAND CREST WAY

Over: I-90

4.5 E JCT I-5, King, WA

Built 1989 ADT: 118,092

EAST MERCER WAY

Over: I-90

5.7 E JCT I-5, King, WA

Built 1988 ADT: 123,219

NORTH MERCER WAY

Over: I-90

5.4 E JCT I-5, King, WA

Built 1989 ADT: 123,219

NE 4TH ST

Over: CITY STREET AND SBCD

2.4 N JCT I-90, King, WA

Built 1989 ADT: 16,919

SHOREWOOD DRIVE

Over: I-90

5.0 E JCT I-5, King, WA

Built 1989 ADT: 123,219

I-5

Over: METRO ACCESS

0.9 N JCT SR 523, King, WA

Built 1990 ADT: 1,144

66TH AVE S

Over: I-405

0.8 N JCT I-5, King, WA

Built 1990 ADT: 153,756

LIND AVE (88TH AVE

Over: I-405

1.1 N JCT SR 181, King, WA

Built 1990 ADT: 166,259

SE 180TH AVE

Over: SR 18

0.9 E JCT SR 516, King, WA

Built 1988 ADT: 36,767

SR 202

Over: SR 522

0.8 E JCT I-405, King, WA

Built 1989 ADT: 62,639

SOUND TRANSIT RAIL

Over: I-5 & CITY STREETS

JCT I-90, King, WA

Built 1991 ADT: 5,488

SE 28TH ST

Over: I-90 E-S RAMP

4.4 E JCT I-5, King, WA

Built 1992 ADT: 5,539

I-90

Over: CITY STREETS

0.1 N JCT I-90, King, WA

Built 1991 ADT: 27,000

NE 124TH ST

Over: RAMP/120TH AVE

5.5 N JCT SR 520, King, WA

Built 1990 ADT: 6,271

PEDESTRIAN

Over: RAINIER AVE S

0.6 E JCT I-5, King, WA

Built 1992 ADT: 28,381

I-90

Over: RAINIER AVE S

0.6 E JCT I-5, King, WA

Built 1992 ADT: 28,381

PEDESTRIAN

Over: SR 90 RAMP

0.7 E JCT I-5, King, WA

Built 1992 ADT: 8,799

E-E RAMP

Over: I-90, RAMPS, MERCER SL

6.4 E JCT I-5, King, WA

Built 1993 ADT: 68,450

S-E RAMP I-405

Over: SR 520

JCT I-405, King, WA

Built 1993 ADT: 64,231

E-N RAMP SR 520

Over: I-405 & SR 520

3.7 N JCT I-90, King, WA

Built 1993 ADT: 162,591

RENTON AVE S

Over: SR 405

0.9 N JCT SR 515, King, WA

Built 1994 ADT: 169,413

CEDAR AVE S

Over: I-405

0.8 N JCT SR 515, King, WA

Built 1993 ADT: 169,413

I-405

Over: SR 169

10.0 N JCT SR 18, King, WA

Built 1994 ADT: 39,269

I-90 RAMP

Over: MERCER SLOUGH, I-90

6.4 E JCT I-5, King, WA

Built 1995 ADT: 68,450

BICYCLE/PEDESTR.

Over: I-90 RAMP EB TO RAINIER

0.6 E JCT I-5, King, WA

Built 1995 ADT: 6,034

I-5 SBCD

Over: SR 104/205TH ST

1.2 E JCT SR 99, King, WA

Built 1995 ADT: 43,749

SR 18

Over: BNRR, AUBURN-BLK DIAMOND

2.3 E JCT SR 164, King, WA

Built 1995 ADT: 9,224

PEDESTRIANS

Over: SR 519

W END MARION ST, King, WA

Built 1994 ADT: 12,000

SR 520

Over: PKWY & SAMMAMISH RIVER

4.9 E JCT I-405, King, WA

Built 1995 ADT: 38,940

SR 520

Over: SR 202 & BIKE PATH

7.7 E JCT SR 522, King, WA

Built 1995 ADT: 35,875

ACCESS (AVONDALE)

Over: RAMP & NE 76TH

0.1 E JCT SR 520, King, WA

Built 1996 ADT: 16,261

SR 99

Over: DUWAMISH RIVER

0.1 N JCT SR 509, King, WA

Built 1996 ADT: 22,940

I-5 RAMP

Over: NORTHGATE WAY

2.0 N JCT SR 522, King, WA

Built 1995 ADT: 45,581

SE 188TH ST

Over: SR 18

4.0 E JCT SR 169, King, WA

Built 1996 ADT: 22,663

SR 18

Over: HOLDER CR HOBART RD

4.6 E JCT SR 169, King, WA

Built 1996 ADT: 8,691

I-5 HOV LANES

Over: I-405 NB, RAMPS

JCT I-5, King, WA

Built 1996 ADT: 36,699

E-N RAMP

Over: SR 900

JCT I-405, King, WA

Built 1997 ADT: 25,253

304TH ST

Over: SR 18

4.6 E JCT SR 164, King, WA

Built 1997 ADT: 54,920

SE 312TH WAY

Over: SR 18

3.8 E JCT SR 164, King, WA

Built 1997 ADT: 54,920

COVINGTON WAY SE

Over: SR 18

7.1 E JCT SR 164, King, WA

Built 1997 ADT: 28,822

Read our methodology - how this data is sourced, computed, and verified.

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Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

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